Means for utilizing radiated heat of boilers



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P. H. BUTTS. MEANS FOR UTILIZING RADIATED HEAT 0F BOILERS. No. 409.915. Patented Aug. 27, 1889.

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P. H. BUTTS. MEANS FOR UTILIZING R ADIATED HEAT OIBOILERS.

No. 409,915. I Patented Aug. 27, 1889.

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UNITED STATES PATENT OFFICE;

FRANK II. BUTTS, OF MINNEAPOLIS, MINNESOTA.

MEANS FOR UTILIZING RADiATED HEAT OF BOILERS.

SPECIFICATION forming part of Letters Patent N 0. 409,915, dated August 27, 1889.

Application filed May 6, 1889. Serial No. 809,767. (No model.)

To all whom it may concern.-

Be it known that I, FRANK II. Burrs, of Minneapolis, in the county of IIennepin and State of Minnesota, have invented certain new and useful Improvements in Means for Utilizing the Radiated Heat of Steam-Boilers, of which the following is a specification.

My invention relates to steam-boilers of usual form and arrangement; and its object is to utilize the heat radiated from the boilerfront and breeching and base of smoke-stack in warming the air drawn into the fire-box, and also to diminish the temperature of the boiler-room; and it consists, generally,in the construction and combination hereinafter described, and particularly pointed out in the claims.

IVith a boiler of ordinary construction and arrangement the heat radiated from it makes the temperature of the boiler-room at times almost unbearable, and a large amount of heat is wasted. By the use of my improve ment this waste heat is thoroughly utilized in warming the air taken in at the draftdoors to assist combustion, and the excessive temperatu re of the boiler-room is reduced, so 'tl'iat even in hot weather it is not uncomfortable for the firemen, even in close proximity to the boiler. I accomplish this result by inclosing the heated radiating-surfaces of the boiler and its attachments in a jacket or case, through which the air is conveyed to the tirebox, taking up the radiated heat and carry ing it into the fire-box, the air being preferably taken from the upper partof the boilerroom.

- In the drawings forming part of this specification, Figure 1. is a longitudinal vertical section of a boiler fitted with my improvement. Fig. 2 is a sectional view of same on line a of Fig. 1, and Fig. :3 is a front elevation of same. I

In the drawings, 2 represents the boiler having the lines 3; l, the tire-box underneath the same; 5, the ashpit having the draftopenin gs 7.

9 is the smoke line having the checkdamper 10. Entirely surrounding the smoke line and boiler-front is the jacket or casing 11, preferably of sheet-iron, and provided with suitable doors 8 and 13, opening, respectively, to the fire-box and ash-pit doors.and to the door 12 in front of the boiler-.tlues, for the purpose of giving access to these parts. Arranged in the wall of the jacket, preferably at as high a point as possible, is a suitable air-inlet 16, having the door 14:. This dooris preferably hinged and provided with a suitable lifting cord or chain 15, running over suitable sheaves 1'7 and 1S, and hanging down in convenient reach from the floor of the room.

Any suitable means of securing it may be employed to hold the door 1-1.- open to any desired extent to control the inflow of air. The air enteri n g the opening 16 passes around and over the heated surfaces of the smoke-flue or breeching, thence downward over the boilerfront, and into the draft-openings to the fire. The air, being taken from the upper part of the room, thus carries off the excess of heat in the room, and the jacket is kept comparatively cool, so that no discomfort is experienced from being in close proximity to the boiler, and the air taken into the fire-box to assist the combustion is at a high temperatu re, whereby a material ecouomizing of fuel is attained. By means of the outer doors L and 1 3 convenient access is afforded to the different parts of the boiler.

I claim as my invention 1. The combination, with a steam-boiler, of

a casin g surrounding and inclosing the front of the boiler and its firebox and ash-pit doors, and the uptake or smoke-pipe of the same, with. a continuous air-space between said easing and said surfaces having communication with the tire-box of the boiler, and an inlet for the outer air arranged at or near the top of said casing, whereby the air taken into the fire-box is received from the upper part of the boiler-room and conducted over the heated surfaces of the boiler directly to the draftopening, substantially as and for the purposes set forth.

2. The combination, with a steanrboiler, of the casing 11, inclosing the smoke-pipe and boiler-front, with a continuous air-space between the same communicating with the ashpit, and the air-inlet 16, arranged in the upper part of said casing, provided with the door 11, and the doors 8 and 13, arranged in said casing and allowing access to the lire-box and ash-pit doors and boiler-front, substantially as described.

In testimony whereof I hereunto set my hand this 1st day of May, 1880.

FRANK II. BUTS.

In presence of- A. M. GASKILL, BEssiE BOOTH.

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